Jonas Bonn | 88ef7f3 | 2011-06-04 22:30:12 +0300 | [diff] [blame] | 1 | /* |
| 2 | * OpenRISC Linux |
| 3 | * |
| 4 | * Linux architectural port borrowing liberally from similar works of |
| 5 | * others. All original copyrights apply as per the original source |
| 6 | * declaration. |
| 7 | * |
| 8 | * OpenRISC implementation: |
| 9 | * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
| 10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
| 11 | * et al. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | */ |
| 18 | |
| 19 | #ifndef _ASM_THREAD_INFO_H |
| 20 | #define _ASM_THREAD_INFO_H |
| 21 | |
| 22 | #ifdef __KERNEL__ |
| 23 | |
| 24 | #ifndef __ASSEMBLY__ |
| 25 | #include <asm/types.h> |
| 26 | #include <asm/processor.h> |
| 27 | #endif |
| 28 | |
| 29 | |
| 30 | /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. |
| 31 | * normally, the stack is found by doing something like p + THREAD_SIZE |
| 32 | * in or32, a page is 8192 bytes, which seems like a sane size |
| 33 | */ |
| 34 | |
| 35 | #define THREAD_SIZE_ORDER 0 |
| 36 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
| 37 | |
| 38 | /* |
| 39 | * low level task data that entry.S needs immediate access to |
| 40 | * - this struct should fit entirely inside of one cache line |
| 41 | * - this struct shares the supervisor stack pages |
| 42 | * - if the contents of this structure are changed, the assembly constants |
| 43 | * must also be changed |
| 44 | */ |
| 45 | #ifndef __ASSEMBLY__ |
| 46 | |
| 47 | typedef unsigned long mm_segment_t; |
| 48 | |
| 49 | struct thread_info { |
| 50 | struct task_struct *task; /* main task structure */ |
| 51 | struct exec_domain *exec_domain; /* execution domain */ |
| 52 | unsigned long flags; /* low level flags */ |
| 53 | __u32 cpu; /* current CPU */ |
| 54 | __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ |
| 55 | |
| 56 | mm_segment_t addr_limit; /* thread address space: |
| 57 | 0-0x7FFFFFFF for user-thead |
| 58 | 0-0xFFFFFFFF for kernel-thread |
| 59 | */ |
| 60 | struct restart_block restart_block; |
| 61 | __u8 supervisor_stack[0]; |
| 62 | |
| 63 | /* saved context data */ |
| 64 | unsigned long ksp; |
| 65 | }; |
| 66 | #endif |
| 67 | |
| 68 | /* |
| 69 | * macros/functions for gaining access to the thread information structure |
| 70 | * |
| 71 | * preempt_count needs to be 1 initially, until the scheduler is functional. |
| 72 | */ |
| 73 | #ifndef __ASSEMBLY__ |
| 74 | #define INIT_THREAD_INFO(tsk) \ |
| 75 | { \ |
| 76 | .task = &tsk, \ |
| 77 | .exec_domain = &default_exec_domain, \ |
| 78 | .flags = 0, \ |
| 79 | .cpu = 0, \ |
| 80 | .preempt_count = 1, \ |
| 81 | .addr_limit = KERNEL_DS, \ |
| 82 | .restart_block = { \ |
| 83 | .fn = do_no_restart_syscall, \ |
| 84 | }, \ |
| 85 | .ksp = 0, \ |
| 86 | } |
| 87 | |
| 88 | #define init_thread_info (init_thread_union.thread_info) |
| 89 | |
| 90 | /* how to get the thread information struct from C */ |
| 91 | register struct thread_info *current_thread_info_reg asm("r10"); |
| 92 | #define current_thread_info() (current_thread_info_reg) |
| 93 | |
| 94 | #define get_thread_info(ti) get_task_struct((ti)->task) |
| 95 | #define put_thread_info(ti) put_task_struct((ti)->task) |
| 96 | |
| 97 | #endif /* !__ASSEMBLY__ */ |
| 98 | |
| 99 | /* |
| 100 | * thread information flags |
| 101 | * these are process state flags that various assembly files may need to |
| 102 | * access |
| 103 | * - pending work-to-be-done flags are in LSW |
| 104 | * - other flags in MSW |
| 105 | */ |
| 106 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
| 107 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| 108 | #define TIF_SIGPENDING 2 /* signal pending */ |
| 109 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| 110 | #define TIF_SINGLESTEP 4 /* restore singlestep on return to user |
| 111 | * mode |
| 112 | */ |
| 113 | #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ |
| 114 | #define TIF_RESTORE_SIGMASK 9 |
| 115 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED |
| 116 | */ |
| 117 | #define TIF_MEMDIE 17 |
| 118 | |
| 119 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 120 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 121 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 122 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 123 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) |
| 124 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
| 125 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 126 | |
| 127 | |
| 128 | /* Work to do when returning from interrupt/exception */ |
| 129 | /* For OpenRISC, this is anything in the LSW other than syscall trace */ |
| 130 | #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP)) |
| 131 | |
| 132 | #endif /* __KERNEL__ */ |
| 133 | |
| 134 | #endif /* _ASM_THREAD_INFO_H */ |